Perhaps you should try some spelling variations:
luan thuc » dan thuc, nhan thuc, toan thuc
vat hanh » vat thanh, van hanh, va hanh
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va luan » vay luan, van luan, va quan
doi cua » dai cua, hoi cua
di cua » dai cua, de cua, do cua

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 ky nang xa hoi. hieu va luan thuc vat hanh ((di cua) or (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. hieu va luan thuc vat hanh ((di cua) OR (doi cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. hieu va luan thuc vat hanh ((di cua) or (doi cua)) tre*.