Perhaps you should try some spelling variations:
thieu bien » thieu nien, tieu bieu, hien bien
thuat lanh » thuat lap, thuat san
hanh thai » nhanh thai, hinh thai, hanh tai
thai cua » than cua, tai cuc, tri cua
bien cac » vien cac, dien cac, bien ca
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
tu sach » thu sach, su sach, te sach
nang ro » nang co, nang ho, nang ra
tuc va » thuc va, truc va, tuc xa
nang o » nang co, nang ho, nang x
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat lanh)) ky ((nang o) OR (nang ro)) hoi. thieu bien cac tuc va hanh thai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat lanh)) ky ((nang o) OR (nang ro)) hoi. thieu bien cac tuc va hanh thai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat lanh)) ky ((nang o) OR (nang ro)) hoi. thieu bien cac tuc va hanh thai cua te*".