Perhaps you should try some spelling variations:
nang han » nang phan, nang hang, nang hanh
tham hoc » thai hoc, tham hoa, than hoc
nang ha » nang hai, nang hoa, lang ha
hieu va » lieu va, hieu qua
va tham » van tham, va cham, va thanh
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
te cac » tu cac, ve cac, te cao
vi cua » di 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 cac ky ((nang ha) or (nang han)) hoi. hieu va tham hoc va hanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang ha) OR (nang han)) hoi. hieu va tham hoc va hanh ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang ha) or (nang han)) hoi. hieu va tham hoc va hanh ((vi cua) or (vai cua)) tre*.