Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
cac luc » cau luc, coc luc, cac nuoc
ky tang » ky nang, kho tang, ky trong
va hanh » van hanh, va thanh, va danh
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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 san)) ((ky tang) OR (ky dang)) ma hoi. hieu ve cac luc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ((ky tang) OR (ky dang)) ma hoi. hieu ve cac luc va hanh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat san)) ((ky tang) OR (ky dang)) ma hoi. hieu ve cac luc va hanh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ((ky tang) OR (ky dang)) ma hoi. hieu ve cac luc va hanh dai cua tu*.