Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
su sach » so sach, vu sach
qua dau » qua da, qua bau, qua dan
dau cua » dai cua, day cua, cau cua
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang
vi cua » vai cua, di cua
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 (thu hoach)) ((y nang) OR (v nang)) xa hoi. hieu qua dau cua vat hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu hoach)) ((y nang) OR (v nang)) xa hoi. hieu qua dau cua vat hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (thu hoach)) ((y nang) OR (v nang)) xa hoi. hieu qua dau cua vat hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu hoach)) ((y nang) OR (v nang)) xa hoi. hieu qua dau cua vat hanh vi cua te*.