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
van cuu » van cau, van chu, van cua
hanh tu » anh tu, danh tu
y nang » ky nang, ly nang, v nang
van cu » van cau, van chu, van cua
tu cua » hu cua, vu 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)) y nang xa hoi. thien ((van cuu) OR (van cu)) thuc vat hanh tu cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y nang xa hoi. thien ((van cuu) OR (van cu)) thuc vat hanh tu cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) y nang xa hoi. thien ((van cuu) OR (van cu)) thuc vat hanh tu cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) y nang xa hoi. thien ((van cuu) OR (van cu)) thuc vat hanh tu cua te*.