Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
chau tre » chay tren, chau tho, cho tre
nam thuc » nam thuoc, am thuc, nam thu
va danh » va dinh, va dan, dia danh
va hanh » van hanh, va thanh, ban hanh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve nam » he nam, va nam, le nam

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 sach)) ky nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) lai chau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat sach)) ky nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) lai chau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat sach)) ky nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) lai chau tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat sach)) ky nang xa hoi. hieu ve nam thuc ((va hanh) OR (va danh)) lai chau tre*.