Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
thu ban » thu hang
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
ma hoi » mai hoi, xa hoi, ma hoa
ve cum » ve cua
te cua » tue cua, le cua, de cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ly nang ma hoi. hieu van nam thu ban thanh ((ve cum) or (te cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ly nang ma hoi. hieu van nam thu ban thanh ((ve cum) OR (te cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ly nang ma hoi. hieu van nam thu ban thanh ((ve cum) or (te cua)) tre*.