Perhaps you should try some spelling variations:
tiep tieng » tap tieng, tien tien, tiep trong
bach tuoc » sach duoc, sach nuoc
hieu viec » nhieu viec, hieu ve, sieu viet
cuu tre » cau tren, cau treo
dinh di » dinh du, dinh vi, danh di
va dinh » van dinh, va kinh, va tinh
tuoc va » thuoc va, nuoc va, duoc va
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cua tre » cua te, cua triet, dua tren

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang xa hoi. ((tiep tieng) or (hieu viec)) bach tuoc va dinh di ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. ((tiep tieng) OR (hieu viec)) bach tuoc va dinh di ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. ((tiep tieng) or (hieu viec)) bach tuoc va dinh di ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. ((tiep tieng) or (hieu viec)) bach tuoc va dinh di ((cuu tre) OR (cua tre))*.