Perhaps you should try some spelling variations:
tu sang » thu sang, tu san, tu lang
sang ky » sang kyo, dang ky, tang ky
lang xa » lang ha, dang xay, lang van
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
ve hoc » te hoc, va hoc, vi hoc
vi cua » vai cua
di cua » dai cua, doi cua, de cua
nuoc » quoc, duoc, ngoc

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sang ky ((lang xa) or (nang ma)) hoi. hieu ve hoc nuoc va hanh ((vi cua) or (di cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sang ky ((lang xa) OR (nang ma)) hoi. hieu ve hoc nuoc va hanh ((vi cua) OR (di cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu sang ky ((lang xa) or (nang ma)) hoi. hieu ve hoc nuoc va hanh ((vi cua) or (di cua)) tre*.