Perhaps you should try some spelling variations:
nuoc san » nuoc luan, nguoi san, nuoc quan
dieu cua » dieu tra
ky lang » ky nang, ky dang, tay lang
ky tang » ky nang, ky dang, kho tang
truc vu » truc du, truc va, truc cu
vu hanh » vu khanh, vu thanh, du hanh
ky cau » ky chau, ke cau
de cua » le cua, te cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: nuoc san ((ky lang) or (ky tang)) xa hoi. hieu ky cau truc vu hanh ((de cua) OR (dieu cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: nuoc san ((ky lang) OR (ky tang)) xa hoi. hieu ky cau truc vu hanh ((de cua) OR (dieu cua)) tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "nuoc san ((ky lang) or (ky tang)) xa hoi. hieu ky cau truc vu hanh ((de cua) OR (dieu cua)) tre*".