Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh tai
hoc sach » hoc sinh, hoc cac, hoc anh
cac thuc » cach thuc, cac thu, can thuc
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
van cac » van hac, van cau, van bac
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
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 (vu bach))) or (hoc sach)) ky nang ma hoi. hieu van cac thuc va hanh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((tu sach) OR (vu bach))) OR (hoc sach)) ky nang ma hoi. hieu van cac thuc va hanh vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) or (vu bach))) or (hoc sach)) ky nang ma hoi. hieu van cac thuc va hanh vai cua te*.