Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau
y nang » ky nang, ly nang, v nang
va cao » va cac, va co, va dao

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 y nang xa hoi. hieu va cao ((duc van) or (duc va)) minh ((vai cua) OR (lai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang xa hoi. hieu va cao ((duc van) OR (duc va)) minh ((vai cua) OR (lai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang xa hoi. hieu va cao ((duc van) or (duc va)) minh ((vai cua) OR (lai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang xa hoi. hieu va cao ((duc van) or (duc va)) minh ((vai cua) OR (lai cua)) tre*.