Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
thu sach » tu sach, thuat sach, thuoc sach
tu cach » tu cac
va hanh » van hanh, va thanh, va danh
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
cuc tre » duc tre, cua tre, cuu tre
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » vien cac
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky tang ma hoi. hieu ((ve cac) OR (va cac)) tuc va hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky tang ma hoi. hieu ((ve cac) OR (va cac)) tuc va hanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (thu sach)) ky tang ma hoi. hieu ((ve cac) OR (va cac)) tuc va hanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky tang ma hoi. hieu ((ve cac) OR (va cac)) tuc va hanh tai cuc tre*.