Perhaps you should try some spelling variations:
cua triet » su triet, va triet
hanh thai » nhanh thai, hinh thai, hanh tai
hieu van » hieu va, thien van, lieu va
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
van bac » van ban, van bao, van hac
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, 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. hieu van bac duc va hanh thai ((cua tre) or (((cua triet) OR (cua viet))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. hieu van bac duc va hanh thai ((cua tre) OR (((cua triet) OR (cua viet)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. hieu van bac duc va hanh thai ((cua tre) or (((cua triet) OR (cua viet))))".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. hieu van bac duc va hanh thai ((cua tre) or (((cua triet) OR (cua viet))))*.