Perhaps you should try some spelling variations:
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, tu cach
te sach » toc sach
nang xa » nang x, lang xa, nang ma
qua dau » qua da, qua bau, qua dan
dau cua » dai cua, day cua, cau cua
y nang » ky nang, ly nang, v 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: ((((tu sach) OR (te sach))) or (thu hoach)) y 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: ((((tu sach) OR (te sach))) OR (thu hoach)) y 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: "((((tu sach) OR (te sach))) or (thu hoach)) y nang xa hoi. hieu qua dau cua vat hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((((tu sach) OR (te sach))) or (thu hoach)) y nang xa hoi. hieu qua dau cua vat hanh vi cua te*.