Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
duc manh » suc manh, duc anh, duc minh
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
duc van » duc va, duc tan, duc phan
vai cua » hai cua, lai cua, bai cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang xa hoi. hieu va pham ((duc van) OR (duc manh)) hanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. hieu va pham ((duc van) OR (duc manh)) hanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. hieu va pham ((duc van) OR (duc manh)) hanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. hieu va pham ((duc van) OR (duc manh)) hanh ((vai cua) or (dai cua)) tre*.