Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
khanh bui » thanh bui, thanh bai, khanh duy
toc sach » hoc sach, doc sach, thuoc sach
bui dau » bi dau, buoc dau
truc va » thuc va, thuc vat, trung va
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tuc va » thuc va, tuc xa, duc va
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) ty nang xa hoi. hieu va cam ((tuc va) or (truc va)) khanh bui dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang xa hoi. hieu va cam ((tuc va) OR (truc va)) khanh bui dau tieng*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang xa hoi. hieu va cam ((tuc va) or (truc va)) khanh bui dau tieng*".