Perhaps you should try some spelling variations:
vu khach » vu khac, vay khach, cua khach
vu khanh » vu thanh, van khanh, duy khanh
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
van cau » van dau, van hau, van chat
truc va » thuc va, thuc vat, trung va
dan dai » dat dai, can dai, dan dat
ma hoi » mai hoi, xa hoi, ma hoa
va dan » ca dan, va dao, va dau
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: ((su sach) or (((vu khach) OR (vu khanh)))) ky nang ma hoi. hieu van cau truc va dan dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (((vu khach) OR (vu khanh)))) ky nang ma hoi. hieu van cau truc va dan dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (((vu khach) OR (vu khanh)))) ky nang ma hoi. hieu van cau truc va dan dai cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (((vu khach) OR (vu khanh)))) ky nang ma hoi. hieu van cau truc va dan dai cua te*.