Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
nang ma » tang ma, sang ma, nang cao
van cac » van hac, van cau, van bac
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de cua
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: ((toc sach) or (thuat sach)) ky nang ma hoa. hieu van cac ((cua ban) or (duc tan)) hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (thuat sach)) ky nang ma hoa. hieu van cac ((cua ban) OR (duc tan)) hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (thuat sach)) ky nang ma hoa. hieu van cac ((cua ban) or (duc tan)) hanh di cua te*.