Perhaps you should try some spelling variations:
nang tao » nang cao, sang tao, nang tai
hieu van » hieu va, thien van, lieu va
luoc can » luc canh, hoc can, luoc dai
tao hoi » tao khoi, tao boi, tay hoi
van cac » van hac, van cau, van bac
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
vi cua » vai cua
di cua » dai cua, doi cua, de cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky nang tao hoi. hieu van cac ((duc van) or (luoc can)) hanh ((vi cua) OR (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky nang tao hoi. hieu van cac ((duc van) OR (luoc can)) hanh ((vi cua) OR (di cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky nang tao hoi. hieu van cac ((duc van) or (luoc can)) hanh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky nang tao hoi. hieu van cac ((duc van) or (luoc can)) hanh ((vi cua) OR (di cua)) tre*.