Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nam thue » nam thu, nam thuc, lam thue
tang tai » hang tai, dung tai, sang tao
cam thue » cam thu, lam thue, cam thiet
tai cua » thai cua, tai cuc, tri cua
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
ha tang » phap tang, cao tang, kho tang
y nang » ky nang, v nang, may nang
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: thuat sach ((y nang) or (ly nang)) mai hoi. hieu va ((cam thue) OR (nam thue)) ha tang tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (ly nang)) mai hoi. hieu va ((cam thue) OR (nam thue)) ha tang tai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) or (ly nang)) mai hoi. hieu va ((cam thue) OR (nam thue)) ha tang tai cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (ly nang)) mai hoi. hieu va ((cam thue) OR (nam thue)) ha tang tai cua te*.