Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
tuc van » thuc van, truc van, tuc va
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
cuc tre » duc tre, cua tre, cuu tre
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
ve cac » va cac, vien cac

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 (thu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc van hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc van hanh tai cuc tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu sach)) ky ((nang xa) OR (nang ma)) hoi. hieu ve cac tuc van hanh tai cuc tre*".